What is ethmoid sinus? There are four pairs of sinuses in the facial region near your nose or eyes. They are called Paranasal sinuses. They are maxillary sinuses, frontal sinuses, sphenoid sinuses and ethmoid sinuses. Of these the ethmoid sinuses is the collective name of for ethmoidal air cells.

Let us understand more clearly what is ethmoid sinus? Each of the ethmoid sinuses is an air filled space enclosed by our ethmoid bone. This ethmoidal air cells consist of numerous thin walled cavities. The ethmoid sinus lies between the the orbits and upper parts of the nasal cavities. The laminae bone is a sheet of bone which separates them.

Here is more on what is ethmoid sinus. Ethmoid Sinuses are a pair of air filled, match box sized mucus lined cavities located just above the nose and below the eyes. The pair of sinuses drain into the nose through a set of small openings.

Anatomically ethmoid sinuses is divided into three parts. They are as follows:-Posterior ethmoid sinus, Middle Ethmoid sinus, and anterior ethmoid sinus. The anterior ethmoid sinus is the most crucial of all these divisions because the frontal and mxillary sinus drain through this section into the nose.

What is Ethmoid Sinus can also be understood as an infection of Ethmoid Sinus. The infection occurs due to bacteria like Streptococcus pneumoniae, Staphylococcus aureus, Haemophilus influenza and Streptococcus pyogenesand others. Exposure to pollutants, smoke and allergens. Sometimes the sinus is also infected by fungal bodies, placement of feeding tubes, polyps, tumors and URT infection.